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The King's Last Recipe
The King’s Last Recipe
- Author: Utkarsh
This is a cryptography-based CTF involving multiple encoding layers and hidden clues.
The original Google Doc contains hidden white-on-white text. Selecting the page contents reveals:
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K;v>Sk,6xIrfXt3EJw<nlld)t7h9S2RuIR'Diqb/ysC3?NaZ=1h\sT6:su[llzdxGh1!cyWbK'j9XK6sHkkppx57KzH6({(Z@=vkhV4/yak!kv41Hm_LQ'$<ZT)(9E
This string is encoded using Base92 followed by ROT13. Reversing these operations gives a link to a second Google Doc.
The second document contains the encrypted key.
The story in the first document provides the encoding layers in order:
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64 → 64 → 8 → 32 → 45 → 58 → 62 → 64 → 92
Therefore, the layers must be decoded in reverse order:
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Base92 → Base64 → Base62 → Base58 → Base45 → Base32 → Octal → Base64 → Base64
Using CyberChef with the corresponding From Base operations reveals:
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B3LL4_C1A0
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CYS{B3LL4_C1A0}